const API_BASE_URL = '/api'

export interface Project {
  id: number
  project_name: string
  project_desc: string | null
  created_at: string | null
}

export interface ProjectCreateRequest {
  project_name: string
  project_desc?: string
}

export interface ProjectUpdateRequest {
  project_name?: string
  project_desc?: string
}

class ProjectService {
  /**
   * Get all projects the current user is a member of.
   */
  async getMyProjects(): Promise<Project[]> {
    try {
      const response = await fetch(`${API_BASE_URL}/projects`, {
        method: 'GET',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }

      const projects: Project[] = await response.json()
      return projects
    } catch (error) {
      console.error('Failed to fetch projects:', error)
      throw error
    }
  }

  /**
   * Get a specific project by ID.
   */
  async getProject(projectId: number): Promise<Project> {
    try {
      const response = await fetch(`${API_BASE_URL}/projects/${projectId}`, {
        method: 'GET',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }

      const project: Project = await response.json()
      return project
    } catch (error) {
      console.error('Failed to fetch project:', error)
      throw error
    }
  }

  /**
   * Create a new project.
   */
  async createProject(data: ProjectCreateRequest): Promise<Project> {
    try {
      const response = await fetch(`${API_BASE_URL}/projects`, {
        method: 'POST',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(data),
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }

      const project: Project = await response.json()
      return project
    } catch (error) {
      console.error('Failed to create project:', error)
      throw error
    }
  }

  /**
   * Update an existing project.
   */
  async updateProject(projectId: number, data: ProjectUpdateRequest): Promise<Project> {
    try {
      const response = await fetch(`${API_BASE_URL}/projects/${projectId}`, {
        method: 'PUT',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(data),
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }

      const project: Project = await response.json()
      return project
    } catch (error) {
      console.error('Failed to update project:', error)
      throw error
    }
  }

  /**
   * Delete a project.
   */
  async deleteProject(projectId: number): Promise<void> {
    try {
      const response = await fetch(`${API_BASE_URL}/projects/${projectId}`, {
        method: 'DELETE',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }
    } catch (error) {
      console.error('Failed to delete project:', error)
      throw error
    }
  }

  /**
   * Add a member to a project.
   */
  async addMember(projectId: number, userId: number): Promise<void> {
    try {
      const response = await fetch(`${API_BASE_URL}/projects/${projectId}/members`, {
        method: 'POST',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ user_id: userId }),
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }
    } catch (error) {
      console.error('Failed to add member:', error)
      throw error
    }
  }

  /**
   * Remove a member from a project.
   */
  async removeMember(projectId: number, userId: number): Promise<void> {
    try {
      const response = await fetch(`${API_BASE_URL}/projects/${projectId}/members/${userId}`, {
        method: 'DELETE',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }
    } catch (error) {
      console.error('Failed to remove member:', error)
      throw error
    }
  }
}

export const projectService = new ProjectService()